This is a really cool project/idea. It takes proven technologies and implements them in a whole new way. Our heads are spinning at the design and civil engineering possibilities. It does seem to be area specific though. Can’t wait tot drive through one!
https://www.wired.com/2016/07/submerged-floating-bridge-isnt-worst-idea-norways-ever/#slide-2
https://www.wired.com/2016/07/submerged-floating-bridge-isnt-worst-idea-norways-ever/